dornfeld



(No Model.) 2 Sheets-Sheet 1.

C. DORNFELD.

EOLEEE EOE INLmI'DEsGEET4 ELEGTEIG LAMES.

No. 307,270. Patented Oct. Z8, 1884.

ng 1 Fgff Q'B l' N. FEYES. Phalulmgmpmr. Winningen. D. C.

(No Model.) 2 Sheets-Sheet 2.

0.-DORNFELD- HOLDER POB, INGANDLSGBNT ELECTRIC LAMPS. No. 307,270. Patented Oct. 28, 1884.

Zi/bren l :e

N. PUERS. Pmwmnugnpmr, wamingwn. n.0

f 'Unirse Sra'ras Partnr Ormea,

CARL DORNFELD, OF COLOGNE, GERMANY.

HOLDER FOR INCANDESCENT ELECTRIC LAMPS.

JPECIPICATION forming part of Letters Patent No. 307,270, dated October 28, 1884. Application filed Februari4 25, IFP-l. (,u'inodel latentcd in England January 28, 1884, No. 2,285.

To @ZZ whom it may concern;

VBe it known that I, CARL DoRNrnLD, a citizen of Prussia, residing at Cologne, in vthe German Empire, electrician, have invented new and useful Improvements in Holders for Incandescent Electric Lamps, of which the following is a specilication.

rlhis invention consists in a new construction of holders or so-called settings for incandescent electric lamps. rlhe obj ect of the construction is to enable the lamp-holders tov be conveniently screwed onto gasaliers, chandeliers, &c., to fit the conducting-wires in the lamp-holder in a conimodious way, to protect the same from contact or any external disturbance, as well as to fix the lamp itself into the holder in the simplest way, and thereby to insure its contact with the conductors. For the attainment of these objects the lamp-holder is constructed of two easily-separable parts, and the neck of the lamp provided with a particular contrivance.

The lamp-holder consists, as stated, ol" two easily-separable parts which can be screwed to.`

one another. The upper portion forms a metal plate with socket-shaped shoulder, the latter having a screw-thread made in its center for union of the whole holder with gas-pipes, chandeliers, bracket-lamps, Sie. On the other side of the plate a disk of insulating material is fixed by two screws, which disk has a screwthread formed on its periphery. rlhis disk carries two Z-shaped-that is to say, biangular-brackets of metal, which are screwed onto the same, and whose screws project into the iuterior of thelamp-holder, and are cach provided with a. nut. These nuts are for the purpose of fastening the conducting-wires to the Z-shaped metal brackets. On the insulatingdisk are placed, underneath the Z -shaped brackets, small metal plates projecting toward the center. These small metal plates, as also the opposite ends ofthe Z-brackets, are drilled through in a vertical direction, and serve as guides for a vertically-arranged pin. Each of. the Z-brackets has a pin of this description. These pins are surrounded by spiral springs, which, on one side rest on the metal plates, and on the other side are so attached to the pins Sothat they tend to press these downward to a holder.

certain limit. This construction is illustrated in the drawings, in which Figure 1 is a vertical section of the holder with its casing removed; Fig. l, a plan or top View thereof; Fig. 2, a section of the casing therefor; Fig. 3, a section of the base of the lamp; Fig. 4, a section of thelamp and socket or holder in position; Fig. 4, a plan view thereof; Figs. 5 and 5, sections and plans, respectively, of a modication.

Figs. l and l*l of the accompanying drawings show, respectively, a vertical section and plan of this upper part of the lamp-holder. a is the metal plate provided with socket-shoulder; b, the disk of insulating material, with screwthread round its periphery; c, thescrews binding a and b together; d d', the Z-shaped metal brackets; rf e', binding-screws of the same; f j", their nuts, which serve for attaching the conducting-wires; r/ g', small metal plates; h h', metal pins vertically arranged; 17 fi', spiral springs.

rlhe lower part ol' the lamp-holder consists of a cylindrical metal casing, on the inside of the upper end of which is a screw-thread,while the lower end is provided on opposite sides of its diameter with angularshaped slits the lower edges of the horizontal parts yof which are inclined down ward slightly. Fi g. 2 shows a vertical section of this part of the lamp- The neck of theincandescent lampi. c., that end of the lamp from which protrude the platinum wires which are connected to the carbon filament-is provided witha cylyndrical-shapcd piece of insulating material, which has on its circumference two diametrically-opposite studs,whichmay be xed on a ring, and which has, furthermore, upon its cir cular surface two small metal plates, preferably of a segmental shape. These plates, which are insulated from one another, each receive one' of the wires from the carbon filament and serve in this way as contacts to the lamp. Fig. 3 shows a vertical section of the neck of the lamp in this shape. 7a forms the insulatingpiece; Z-Z, both studs; mm', the segmental contact-pieces, and a the glass bulb.

Figs. 4 and 4: show an elevation and plan of the lamp and holder fitted together. This is effected in the following manner: The wires IOC proceeding from the chandelier are drawn l through the central opening of the upper part of the lamp-holder. This then being screwed onto the chandelier the ends of the wires are brought by means of the nuts into contact with the Z-shape'd brackets. Then the lower part of the holder is screwed onto the thread of the insulating-disk. On inserting thelamp the studs provided on its neck-piece must catch into the vertical sides of the angular slots of the holder. 'Ihe lamp is then pressed upward as high as is permitted by the angular slots, whereby the spring-pins in the holder are made to rest upon the contact-picces ofthe lamp and tend to push it downward. The lamp being turned slightly in a horizontal direction, the studs on its neck are made to bear, in a similar manner to a bayonet-lock, upcn the horizontal part of the slots, and in consequence of the counter-pressure of the springpins in the holder it obtains a secure fastening. The electric current flows from the wires through the Z-shaliied metal pieces andthe spring-pim` to the small contact-plates of the lamp.

Vith the abovedescribed construction it is possible by turning the outer metal casing to put the lamp out ot' contact. If this is to be l avoided, the arrangement ofthe lamp -h older is, as shown, in part sectional elevation and plan at Figs. and The metal casing,which has the angular slots in it, is in this case :fixed to the insulating-disk by means of two bindingscrews, whereby any turning of this piece so as to bring the lamp out of contact is rendered impossible. In order, however, to be able to fasten the conducting-wires conveniently to the Zshaped brackets, this casingis provided with a corresponding opening, as shown. Over the whole, for guarding against external contact of the wires, is covered another metal case, the saine as before, which is screwed to the insulating-disk.

It is obvious that in the second casing the angular slots are omitted.

tric lamps, consisting ofthe combination of the W 'socketed metal base for attachment to a chandelier or bracket, the insulated bed secured thereto, the Z-shaped conducting-pieces, and thespring-actuated contact-rods, substantially as described.

2. In a socket or holder for incandescent electric lamps, the combination ofthe socketed metal base, the insulatingdisk screw-threaded at its periphery, the Z-shaped metal conductors secured thereon, the spring-actuated contact-rods, and the protecting-case adapted to be secured totheinsulating-disk, substantially as described.

3. The combination of the insulating-disk, the Z-shaped conductors secured thereto, the sIning-actuated contact-rods, the protectingcase capable of attachment to the disk and provided with the angular slot,and the base K of the lamp provided with segments m m, connected to the leading-in wires and with the pins or lugs Z Z', whereby the lamp is secured inthesocket andthepropercircuit-connections therefor formed, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 28th day of January, A. I). 188i.

@aan DORNFELD.

lVitnesses:

ERNsr Cnlmrnn, FRIEDRICH ALBERT Srrncknn.. 

